How do I troubleshoot a faulty brake light in my BMW?

I've noticed that one of my brake lights on my BMW is not working. I've checked the bulb and it seems to be fine. What other steps can I take to diagnose and fix the issue?

First, make sure the brake light switch is not stuck or damaged. If it is, you'll need to replace it. If the switch seems fine, check the wiring and connections for any loose or damaged components. It could be a simple fix with a new wire or connector.

If the wiring and connections look good, you may have a faulty brake light relay. You can test this by swapping it with a known working relay from another part of your car. If the brake light works with the new relay, then you know you need to replace it.

If all else fails, you may have a problem with the brake light circuit on your car's computer. In this case, it's best to take your BMW to a certified mechanic for further diagnosis and repair.